Calibrating the UHF technique of partial discharge detection using a PD simulator

The paper describes a technique for simulating the presence of partial discharges in gas-insulated substation (GIS) equipment. The technique employs a pulse generator to inject current pulses through a suitable protrusion. The current pulses have similar temporal characteristics to those produced by an actual discharge event, with the added advantage that their magnitudes can be controlled accurately. Because the pulses are highly reproducible, they are ideally suited for investigating the UHF technique of partial discharge detection. The paper discusses the relationship between the magnitude of the UHF signal received by a coupler and the discharge magnitude. It also shows that the coupler signal is dependent on the protrusion length and on the spatial relationship between the protrusion and the coupler. The implications for practical discharge measurements in GIS also are discussed. >

[1]  F. Chu,et al.  SF6 Decomposition in Gas-Insulated Equipment , 1986, IEEE Transactions on Electrical Insulation.

[2]  B. Skyberg,et al.  Acoustic diagnoses of GIS; field experience and development of expert system , 1992 .

[3]  M.A.S. Leijon,et al.  Pattern recognition of free metallic particle motion modes in GIS , 1988, Conference Record of the 1988 IEEE International Symposium on Electrical Insulation.

[4]  B. F. Hampton,et al.  A continuous UHF monitor for gas-insulated substations , 1991 .

[5]  D. F. Binns,et al.  Optical discharge detection in SF/sub 6/-insulated systems , 1990 .

[6]  J.H. King,et al.  Three Separate Nanosecond Rise Time Pulse Generators Using Npn Transistors , 1991, Eighth IEEE International Conference on Pulsed Power.

[7]  H.-M. Rein,et al.  Subnanosecond-pulse generator with variable pulsewidth using avalanche transistors , 1975 .

[8]  Li Ming,et al.  PD-source identification in solids , 1992, Conference Record of the 1992 IEEE International Symposium on Electrical Insulation.

[9]  G. Stone,et al.  Fundamental Limitations in the Measurement of Corona and Partial Discharge , 1982, IEEE Transactions on Electrical Insulation.

[10]  A. Bargigia,et al.  Detection of parallel discharges in gas insulated substations , 1992 .